California Gives Final OK To Require Solar Panels On New Houses : NPR

Solar panels will be a required feature on new houses in California, after the state’s Building Standards Commission gave final approval to a housing rule that’s the first of its kind in the United States.

Set to take effect in 2020, the new standard includes an exemption for houses that are often shaded from the sun. It also includes incentives for people to add a high-capacity battery to their home’s electrical system, to store the sun’s energy.